Enhancers are
A) adjacent to the gene that they regulate.
B) required to turn on gene expression when transcription factors are in short supply.
C) the site on DNA to which activators bind.
D) required to facilitate the binding of DNA polymerases.
Answer: C) the site on DNA to which activators bind.
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Identification of unique DNA fingerprints relies on the presence of single nucleotide polymorphisms among samples.
Answer the following statement true (T) or false (F)
Which of the following describes the blood-brain barrier?
A) It is part of the immune system that involves the release of antibodies to protect the brain from infectious agents B) It is a property of the closely packed endothelial cells of the walls of brain capillaries that prevents large molecules from entering the brain C) It is a property of blood vessels of the brain that promotes the diffusion of nutrients into the tissue of the brain D) It is a property of neurons that prevents them from accidentally releasing their neurotransmitters in to the blood circulation
The venomous sea wasp is classified in the phylum
A) Mollusca. B) Annelida. C) Arthropoda. D) Cnidaria. E) Nematoda.
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Figure 30.18C
Which plant hormone listed below is responsible for the symbiotic relationship shown in the accompanying figure?
A. auxin B. gibberellin C. cytokinin D. jasmonic acid E. abscisic acid